According to Christians...

There is always posts on here bashing Christians for following their beliefs and stating what they believe in. Of course the posts have been directed at Christians because according to the bible, homosexuality is a sin. MOST Christian responses are in "support" of the LGBT community but they preface is by saying "I don't judge, none of my business,m who am I to cast a stone". So my question is, despite people "Not judging", are you in fact saying that you are not judging their sin? What exactly are Christians not judging? Is homosexuality a sin and you're saying you wont judge their sin because you to sin? I'm asking because I think the LGBT community might be misunderstanding Christians when they say that. Or maybe they aren't?